Food, at the pig's order (9)
I believe the answer is:
spaghetti
'food' is the definition.
(spaghetti is a kind of food)
'at the pig's order' is the wordplay.
'order' indicates anagramming the letters.
'at'+'the'+'pigs'='atthepigs'
'atthepigs' with letters rearranged gives 'SPAGHETTI'.
(Other definitions for spaghetti that I've seen before include "Type of pasta" , "Popular pasta dish, maybe bolognese" , "Long thin pasta" , "Italian serving" , "It's past eight, time for strange pasta" .)